I would replace the thermostat, it's a cheap part and could explain the overheating, also is your fan running? If it won;t kick on then there is the overheating prob. Might just be a relay or fuse. You might be blowing fuses because of a short in the heater control pannel. I had to replace it on my 94. It cost about $30 dollars from the junk yard and solved my problems. I would start with these few simple fixes. Hope they help, if not, take it to a garage that offers free estimates, then fix the problems they find. I do that sometimes also. Replace the Thermostat.
Remove the wiring harness from the back of your 2005 Chevy Cavalier heater blower motor. Remove the heater blower motor retaining bolts. Remove the heater blower fan.
If the heater is blowing the fuse when the blower is turned on, I would suspect the blower motor is defective or locked up. If the A/C is blowing a fuse, suspect a bad clutch, or locked up compressor.
You probably have a shorted wire going to the motor or switch. You'll have trace the wires and find the damaged section.
Blown fuse, defective blower motor, or defective blower motor resistor pack.
There might be a bad fuse causing the heater to not work. Check the fuses if they are all ok you may have a bad blower motor. when you turn the heater on and no air is blowing then it is your blower motor.
Heater blower motor is defective and locked up, or possible short in the wiring.
check for a blown fuse that says heater or blower motor
check the blower motor resistor
Blown fuse, defective Blower Motor Resistor Pack, Defective Blower Motor, or Defective Blower Motor speed control switch.
Check the fuses.If not the fuse, test the resistor down by the blower motor.
try replaceing the switch that controls the low to high for heater It's gonna be the blower motor resistor (near the blower motor).
is the blower motor running? or is it just not blowing hot air?
There is an electrical short to ground in the fan switch or in the blower motor itself.
the control cable probably came off the connector
the heater matrix is blocked
Ok..I figured it out. Turns out the rear defroster is the problem. When I unplugged it from the back windshield, blower/heater works great!! So...to all those out there..if your blower motor blows fuses...check the blower motor first...then the HVAC and heater fuses, then rear defroster if you have a cavalier!
No, I have a 1998 Cavalier and it does not have a cabin filter. You can take off the 3 bolts off the heater blower and remove any leaves or debris.
Blower motor, resistor, wiring or control problem are common causes
mor vehicle info would help, but blower motor can be shot without blowing fuse
sounds like the head gasket ...same thing just happened in my 97 cavalier
Check your heater core also.
The heater core when air from the blower motor is blowing
Under hood fuse panel box. It is labled "Cooling Fan". To easily check it,swap it out with the "heater blower fan" relay and see if the heater blower works. Both relay's are made the same.
sometimes this is caused by the blower resistor heating up and shutting the circuit down, or it could be in the blower itself heating up and shutting down.